Hey everyone so I'm having trouble figuring out this problem, it's for HW and I don't want to get an answer I just need help having it explained. I wasn't sure if I needed to use the momentum equation to figure it out. Suppose a 1000kg car is traveling at 20 meters/second before experiencing a collision. (a) If the car runs into a steel wall and the collision occurs over the course of 0.5 seconds, then what is the resulting force of impact? So I'm trying to figure out F right? So m=1000 kg, a= 20 m/s or do I need momentum? I'm just confused and need help breaking it down. I don't know where to plug in the 0.5 sec. The car is going from 20 m/s and is stopping but where do I put in the 0.5 sec? Thanks!